Guide for textile machines



Dec. 17, 1929. J. R. MITCHELL GUIDE FOR TEXTILE MACHINES Filed Sept. 20, 1928 Patented Dec. 17, 1929 PATENT OFFICE JOHN R. MITCHELL, OF TRENTON, NEW JERSEY GUIDE FOR TEXTILE MACHINES Application filed September 20, 1828.

This invention relates to thread guides and is particularly adapted for use in'machines for winding and spooling of silk thread or yarn. Thread guides of this type are usu- 5 ally formed of porcelain or other vitreous material and are provided with a slot to receive and guide the thread I An object of the present invention is to so construct the guide as to greatly lessen the objectionable wear due to the friction of the thread, thereby prolonging the life of the guide and increasing its efficiency in dclivering the thread uniformly.

The present invention is an improvement 5 on the guide disclosed in my prior Patent 1,448,076, March 13, 1923, and embodies the essential features of that construction as well as further improvements tending to increase the efficiency of the guide and to prolong the length of life thereof.

A further object of this invention is to pro vide for the renewing of that'surface of the guide which receives the most wear resulting from the friction of the moving thread. It

has been found in practice that the surface of the guide on which the thread rests during its passage through the guide is subjected to considerable wear necessitating frequent replacement of the entire guide.

While the construction disclosed in my prior patent has been found particularly effective in preventing localized wear on the guide, the present arrangement is intended to provide for the removal and replacement of that portion of the guide which receives the most wear, thus obviating the necessity for replacing the entire guide when only a por tion thereof has become worn and unfit for service. It is therefore a feature of this invention to provide a removable wear piece which can be easily inserted in the guide and which can be readily replaced when worn.

A further object of the invention is to provide a removable wear piece having a plurality of surfaces on which the thread may bear so that when one engaging surface of the piece is worn, the piece may be removed and'reinserted so as to present another sur- 5 facefor engagement with the thread, thereby Serial No. 307,218.

prolonging the life not only of the guide but of the wear piece itself.

A further object of the invention is to so construct the guide and wear piece that the thread will be prevented from engaging with the bottom of the guide slot, thus eliminating wear on that portion of the slot, and in so disposing the wear piece within the guide that the thread will be permitted to move up and down in a narrow thread discharge slot, thus dlistributing the wear along the Walls of this s ot.

Another feature of this invention is the provision of a relatively wide opening in the guide through which the thread may enter so that varying portions of the thread supporting surface of the wear piece may be engaged by the thread as the angle of entrance of the thread is varied, in order to distribute the wear along the entire supporting surface.

A further object of the invention is to provide arecess in the upper surface of the guide into which the wear piece may be dropped, the latter being retained in the recess by gravity, thus avoiding the use of a retaining device for holding the wear piece in place and facilitating the removal, reversal, and replacement of the piece.

Various other objects and features of the invention will be apparent from the following description and claims taken in connection with the accompanying drawings, in which:

Figure 1 is a perspective view of the improved guide showing the remcvable wear piece in position therein;

Figure 2 is a front elevation of the guide;

Figure 3 is a View in plan of Fig. 2;

Figure 4 is a section on the line M of Fi 2; v

Figure 5 is a section on the line 55 of Fig. 4; and

Figure 6 is a perspective view of the removable wear piece.

In the embodiment of the invention shown herein for the purpose of illustration, there is disclosed a guide block 10 which is preferably formed with the main portion of its sides inclined symmetrically toward each other from the bottom to the top and its upper surguide I rear; of the-guide sdthatr the threadencounsectlon, and adapted'to receive well-known means, not shown, for securingit tothecarrying rail.

It will be understood-thatthe,foregoing details of description do not constitute part of the present invention and maybe moditied in any desired manner toadapt thezguide for use injya'rious types. of machines.

The guideslot =11 is,"acc'ording=to the present invention, preferably constructed in two portions, a wide entrance portion 17 ffor-zre- 'ceiving'the enteringf thread anda narrowid-is- "charge portion 18., In the: modification illustrated, I have shown jthese portions 'of the slot as tapered from the front to the ters the narrowest portion of the guide slot as it'leaves the yguideh i Thedower-surfaces of the entry and disa charge portions" of theg-uide are preferably rounded as shown-1n Figure -4, fo r convenience in manufacture and to elimlnate -any possible friction on'the thread.

" slot portions cess-20,=and constructed of such ashap'e and w th such -Intfermedi ate the entry and; discharge} portions of the guideslot, theguide is provided with a rec'essQOwhich communicates with the :17 and 18, and r referab ly" extends transversely of the direction of thread feed. Viewing the; construction in *a different light, the transverse guide slot 11 maybe considered I as tudinally extending recess 20; )Wherasi-tlns being intersected by'a long recess is preferably formed'with substantially rectangular-1y,disposed fiat walls as; disclosed herein, it *may' obviously be variously shaped and dimensioned. I 22,"which is'separatelyshown i n Figure 6 of A removable ;wea r piece is adapted to be dropped in rethe drawing,

for that purpose is preferably dimensions that it will closely fit-within the walls ofthe recess withoutbindihgQthenp er face of the wear piece, ,when in positionin the gu ide, being;preferably convejxl'y curved to eliminate unnecessary friction and to';insure sniooth passage. iof. the threadjthroi gh? the guide. According to my invention, both the upper and: lower. surfaces; 23 andj 2 off the wear piece are rounded in; this mannerfsothat when one "surface 1s so: Worn asflto, reduce its efficiency or renderitguseless, the wear p1ece may be "removed-{1reversedgand reinserted lto present a fresh surface-on wliichthe thread may bear. rIt will structed of preferably formed of vitreous material such recess 11 and the corresponding dimension of the wear piece are so pro ortioned that the thread is not permitted to ear on the bottom of the guide slot, but passes over and rests on the wear piece only, thus eliminating any wear on the guide other than at the sides of thegu-ide slot. i c A, v

lltwill {further be seen that this; engaging surfaceis so located with respect to the dislcharge portion 18 of the slot that the thread is'pernntted'tO move-upand down therein, as

in-theconstruction disclosed in my prior patent above'nieiitioned. In this way the Wear dueto -f -rict-ion;on;the ;walls of the discharge portion of the guide slot is distributed and the life of the guide correspondingly prolonged. It will further bQ SQQIlTlhQ/bbY -I'Qfi" son-of the pirovision ofthe wide-entry, portion l7 ofzth'e guide slotfiand the continually changing angular direction of entry {of-the thread into the guide, the thread will ;be permitted to shift longitudinally f 'the wear piece and willdistribute the wear-along this member. p y I I, {Pheguideblock and weanpiecemaybe coni l m er al, b ti r as porcelain. y, p

a A ug a spec fi m ed mente the ,-vention is shown for purposes ofillustration, U it -will be' understood that" itg is not limited to that specific forrn beyond'the extent indicatedin the followingclaims, 7 v

: ng s d cri e -thei nficnr he is claimed as new and desired to be secured by Letters Patentis 1-.As arti le of manufacture, latthread guide comprising a one-pieceblock havinga "transverse guide slot, and ,provided with 3a recess intersectingsaid 1 guide slot :and extending downwardly from-the upper: surface of the block, whereby a movable wear; piece may be inserted downwardly. in said recess andheld therein by gravity. v H

2. A thread'guidecomprising a guide block havinga wide entry guidersloa'a narrow discharge: guide "slot, and afcentrally ldispos'ed recess exte'ndi'njgdownwardly from the upper surface of said block f communicating "with both of, saichslots, and a rernovable wear iece seated'in said recess" having "an "upper surface on which the thread-ni'ay bear, said su' face being disposed abo've the bottom of said guideslots 3. Asanartide of' m' an'ufacture, a-fremov- -a'ble wear piecefor/threadJguidesaconsisting #of a substanti ally rectangular parallelepipedal 'element kha'ving 'two opposite sides there- -'of slightly conve'xed to 5' present smooth unbroken {surfaces on -,wh-ich the, thread-may 1 bear, whereby the element 'bereversed in position toprolong the life thereof.

A, thread guide consistlng pf-a guidc v c v block havingra substantially straight eaned lee-understood that the depth of the W recess disposed centrally thereof, afportion of the front wall of said recess being cut away to constitute an entrance guide for the thread, and the rear wall thereof being provided with a narrow slot forming a discharge guide, and a substantially rectangular parallelepipedal element seated in said recess and having a slightly convexed upper surface on which the thread may bear, said element beingso positioned as to maintain the thread out of contact with the bottom of said guides. 5. A thread guide consisting of a guide block having a centrally disposed recess in the top face thereof, a portion of the front Wall of said recess being cut away to form a wide entrance guide for the thread, and the rear wall thereof being vertically slotted to form a narrow discharge guide tapering toward the front of the block, and a removable wear piece seated in said recess, said wear piece being provided with a curved upper surface on which the thread may bear for maintaining the thread out of contact with the bottom of the guides and permitting the thread to move up and down in the discharge guide to distribute the wear due to friction.

6. A thread guide consisting of a guide block having a centrally disposed recess in the top face thereof and being provided with a wide entrance guide slot and a narrow discharge guide slot for the thread, said slots communicating with said recess, and a wear piece adapted to be dropped in said recess and having conveXly curved faces on two opposite sides thereof on which the thread may bear, whereby the wear piece may be easily removed and replaced or reinserted in reversed position.

7. A thread guide consisting of a guide block having a transverse guide slot. and provided with a recess intersecting said slot, and a removable wear piece for insertion in said recess, said wear piece having two sides rounded off to present a smooth surface on which the thread may bear, whereby the piece may be inserted with either rounded side thereof disposed in position for engagement with the thread.

8. A thread guide consisting of a guide block having a transverse guide slot and provided with a flat sided recess intersecting said slot, and a removable wear piece adapted for insertion in said recess having flat sides for cooperation with said recess and two oppositely disposed curved sides on which the thread may bear, whereby said piece may be reversed in position to present either of said curved sides upwardly to support the thread above the bottom of said guide slot.

9. A device as specified in claim 1 in combination with a wear piece arranged in said recess.

10. A device as specified in claim 1 in combination with a wear piece arranged in said recess, said wear piece having a curved slot.

In testimony whereof I hereunto aflix my signature.

JOHN R. MITCHELL. 

